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Geng L.-L.,Hebei North University | Wang C.,Hebei North University | Yuan W.,Wenzhou University | Song X.-M.,Hebei Shenghua Chemical and Industry Co.
Zeitschrift fur Kristallographie - New Crystal Structures | Year: 2013

C11H17N3O3, triclinic, P1 (no. 2), a = 5.877(1) Å, b = 7.329(2) Å, c = 14.611(3) Å, ( = 75.644(3)°, ' = 85.030(3)°, $ = 85.647(3)°, V = 606.3 Å3, Z = 2, Rgt(F) = 0.0561, wRref(F2) = 0.1870, T = 298 K. © by Oldenbourg Wissenschaftsverlag, München. Source


Geng L.L.,Hebei North University | Ren X.M.,Hebei North University | Mao W.X.,Hebei North University | Song X.M.,Hebei Shenghua Chemical and Industry Co. | And 2 more authors.
Advanced Materials Research | Year: 2014

One acrylic ester of cytosine was synthesized by a facile method, and it' s molecular structure was characterized by NMR, HRMS, and X-ray crystallography. In this paper, the crystal structure of the analog is described and the available data of cytosine. The X-ray crystallography showed that the adjacent molecule of cytosine Derivatives was tied to form analogous antiparallel β-sheet arrangement. © (2014) Trans Tech Publications, Switzerland. Source


Wang W.,Hebei University of Technology | Yuan J.,Hebei University of Technology | Yuan L.,Hebei Shenghua Chemical and Industry Co. | Pan M.,Hebei University of Technology
Gaofenzi Cailiao Kexue Yu Gongcheng/Polymeric Materials Science and Engineering | Year: 2014

Living poly(n-butyl acrylate)s[L-PBAs] were synthesized by single electron transfer-living radical polymerization[SET-LRP]. 1H-NMR was employed to characterize the structure of L-PBAs. By investigating various reaction parameters such as monomer/initiator and monomer/macroinitiator feed ratios and using multistep of living polymerization, the reactivity of L-PBAs was confirmed, and the L-PBAs with controllable average molecular weights were achieved. When the L-PBA was transformed into macroinitiator to re-initiate BA polymerization, relative high monomer conversion (31.3%) was obtained with monomer/macroinitiator mole ratio of 6665/1 at 3.5 h of polymerization time. The results reveal that the macroinitiators have higher reactivity than the first initiator. From GPC results, it is observed that the molecular weight distribution (MWD) of L-PBA prepared by multistep initiation becomes wider with increasing monomer/macroinitiator mole ratio and/or re-initiation step. As a result, MWD appeares double peaks when the molecular weight reaches 1.9×105, which probably ascribes to an imbalance of fast exchange between active and dormant species. Source


Wang P.,Hebei University of Technology | Yuan J.,Hebei University of Technology | Yuan L.,Hebei Shenghua Chemical and Industry Co. | Shen X.,Hebei Shenghua Chemical and Industry Co. | And 2 more authors.
Gaofenzi Cailiao Kexue Yu Gongcheng/Polymeric Materials Science and Engineering | Year: 2014

The composite particles of PBA/PMMA and PBA/PS were prepared by seeded suspension polymerization with butyl acrylate (BA), methyl methacrylate (MMA) and styrene (St) as the monomers. The effects of dispersant molecular weight, swelling time and monomer ratio on morphological structure of the composite particles were mainly investigated. The structure and performance of poly(vinyl chloride)(PVC) blending materials with the composite particles were researched. The study results show that the PVP dispersant with lower molecular weight causes unstable polymerizing, leading to agglomeration of PBA seeds. Comparatively, PVP with higher molecular weight is effective to maintaining the polymerization stability, and the seed size decreases with increasing PVP feed ratio. The notched impact strength of PVC materials modified by PBA/PMMA composites decreases with increasing MMA swelling time, and the toughness of PBA/PS modified PVC materials is enhanced with the core-shell ratio increasing. Moreover, the thermal decomposition temperatures of PVC materials improve with increasing PBA/PS feed. An incorporation of the composite particles is beneficial to reduce processing temperature and improve plasticizing performance of the PVC blends. Source

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